138 



BELL SYSTEM TECHNICAL JOURNAL 



carrying what are now considered moderately high frequencies, this 

 new system employs a single circuit carrying a very broad frequency 

 band. There are many ways in which conducting systems of this 

 type may be constructed. In this connection, of course, facility of 



RUBBER WASHER 



inner conductor 

 (copper) 



LEAD OUTER 

 CONDUCTOR 



Fig. 14 — One of the experimental coaxial structures. 



Fig. 15— Another experimental coaxial structure. 



Fig. 16 — The coaxial cable employed on the experimental installation between 

 New York and Philadelphia. 



n anufacture and ability to withstand the handling incidental to 

 installation, must be considered as well as electrical performance. 

 Some of the experimental types of structure are shown in Figs. 14 

 and 15. In a field trial between New York and Philadelphia, over a 



